transparent background

Put this code into your custom css:

#av-overlay-wrap {background: rgba(255, 255, 255, 0.5);}

Hi, where can i find the custom css in my wordpress site admin?

Are you using a child theme (hopefully)?

Hmmm… I think that I am not very expert on wordpress. I am still learning. I am not very sure what a child theme is about. I appreciate your kind help.

I’m not going to teach you basic WordPress stuff. Google can do that.